A man from the Republic of Korea was tested positive for MERS in Guangdong on May 29. The man has had no fever for four days, but still occasionally coughs and his lungs are inflamed, local health officials said.
They said his condition was returning to stable, but warned that situation might change, state-run Xinhua news agency reported.
The man has tested negative for MERS twice, said Deng Longxi, a doctor from the No. 8 People's Hospital in Guangzhou who is in charge of the treatment.
The man, 44, had visited a MERS patient at a Korean hospital and expressed discomfort as early as May 21.
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Despite a doctor recommending that he cancel his travel plans, he flew to Hong Kong on May 26 and entered Huizhou City via Shenzhen.
Zhong Nanshan, a respiratory expert, said a massive outbreak of MERS in China was unlikely given a lack of evidence on sustained human-to-human transmission of the virus.
Local officials and doctors have expressed confidence in controlling the virus, citing experience gained from outbreaks of bird flu and Severe Acute Respiratory Syndrome (SARS).
In addition, Guangdong is one of the Chinese provinces that has dealt with the bulk of H7N9 bird flu cases since it emerged in 2013.
MERS is a respiratory illness caused by a coronavirus, similar to SARS. The first human case emerged in Saudi Arabia in 2012.
There is no vaccine or treatment for the disease, which has a fatality rate of about 40 per cent.